rdettai commented on issue #1012:
URL: 
https://github.com/apache/arrow-datafusion/issues/1012#issuecomment-921820012


   This also pops a question. The state of execution context is protected by a 
Mutex:
   ```Rust
   pub struct ExecutionContext {
       /// Internal state for the context
       pub state: Arc<Mutex<ExecutionContextState>>,
   }
   ```
   
   Why do some of its methods take `&mut self` ???


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